The System Architecture is a key input document for the technical safety concept (TSC)/Requirements (TSRs). Interestingly, it is also a work product that gets refined by the TSC, often leading to defining new System elements and Interfaces to satisfy Safety requirements. However, several people do not understand why a System Architecture is needed to create the TSC! Shouldn’t it not be that the System Architecture implements the TSRs? Also, what is the right level of information required in a Safety System Architecture?
This article is an attempt to bridge this knowledge gap and support the creation of more ‘Safety friendly!!” System Architectures 😃
What is the purpose of a System Architecture with respect to Safety?
- indicate the elements that perform the different functions of the System
- to describe the Interfaces provided/consumed by the elements (static description)
- to describe how elements interact with one another to achieve the safety function (dynamic description)